- ACRT, Inc
 - Providing powerline clearing and urban forestry services and training to utilities, municipalities, and government agencies; as well as natural resource characterization and mapping. - Bioengineering Group, Inc.
- Provides consulting services for erosion control, water quality, and habitat restoration.
- Bitterroot Restoration, Inc.
- Dedicated to creating, restoring and enhancing native ecosystems and landscapes.
- Center for the Study Of the Environment, The
- Providing information, identification, analysis and solutions to environmental problems. Books and technical publications available.
 Edinburgh Development Consultants
- Specialising in sustainable development; including social development, natural resources and biodiversity, institutional appraisal and NGOs, focusing on Latin America.- Environmental Consultants Inc.
- Vegetation management consulting services for the electric utility industry. Services include distribution system clearance, contract utility arborists, wetland delineation, and herbicide use.
- Envirotech Consultants,Inc.
- Designing natural treatment systems for wastewater, stormwater, and contaminated soils; performing wetlands mitigation and restoration and operating a native prairie and wetland plant nursery.
- Jones & Stokes Associates Environmental Consultants
- Provides natural resource management, planning, and environmental consulting services. Offices in California, Arizona and Washington.
- Jones Technologies, Inc.
- Providing hazardous materials management, assessment and remediation, and natural resource management services.
- Las Pilitas
- California native plant nursery which also offers landscaping and biological/ecological restoration consulting services.
- LSA Associates, Inc.
- Environmental and transportation planning, natural resource and cultural management services.
- MEC Analytical Systems, Inc.
- Specialising in resource management, marine and aquatic sciences, aquatic toxicology, and data management and analysis.
- Pacific Rim Taiga, Inc.
- International natural resource consulting company working on sustainable forest use and business development primarily in North America and Russia.
- ParkWorks
- Suite of software solutions designed specifically for Parks and Recreation maintenance departments.
- Pescares Italia Srl
- Offers services and assistance towards the sustainable use of natural resources. Specialising in the fishery, aquaculture, tourism, and development industries.
- Research Planning, Inc.
- Provides services in three main areas: environmental and coastal resource management, geographic information systems (GIS), and oil spill technology.
- Revegetation Contractors
- Environmental design, contracting and rehabilitation for mining, urban, commercial and government projects.
- SWCA, Inc. Environmental Consultants
- Providing regulatory compliance services, cultural resource management, ecological research, environmental planning, and GIS services.
- Sycamore Associates
- Provides environmental consulting services including biological assessments, impact analyses, restoration and mitigation planning and implementation, regulator permitting, and more.
- TerrAqua Environmental Science and Policy, LLC.
- Helps organisations manage natural resources and resolve environmental problems through market-based approaches to pollution prevention and sustainable development.
- TRC Garrow Associates Inc.
- Environmental consulting. Specialties include archaeology, historic preservation (architecture), wetlands, protected species, and historic cemeteries for the public and private sectors.
- Water Rights, Inc.
- Offer services in hydrogeology, soils and vegetation, riparian and wetlands, irrigation, natural resource permitting, land use planning and water rights.
- Watershed Initiatives
- Provides mediation and facilitation, education forums, and management of watershed and natural resource protection and restoration projects.
- WBM Engineering & Environmental Consultants
- Providing a wide range of engineering and natural resource management services.
- Wetland Ecosystems Australia
- Specialising in the conservation and restoration of remnant wetlands and the development of constructed wetlands.
- White Water Associates
- Services include species surveys; wetland mitigation; assessment and testing; environmental education; resource planning and management.
- Wildlands, Inc.
- Establishes and manages wetlands and wildlife habitat through mitigation banking and restoration projects, both public and private.
- Wildlife Dynamics Consulting
- Specialities include raptor survey design and execution, pellet and prey-remain analysis, radio telemetry, and home-range analysis.
- Wildlife Management Consultants
- Provides management plans, surveys, assessments, mapping, educational workshops, and habitat enhancement services.
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